The effect of CO2 on the viscosity of polystyrene/limonene solutions |
| |
| Affiliation: | 1. Institute of Chemical and Environmental Technology, Department of Chemical Engineering, University of Castilla-la Mancha, Campus Universitario, s/n, 13071, Ciudad Real, Spain;2. School of Chemistry, University Park, Nottingham NG7 2RD, UK;1. Planta Piloto de Ingeniería Química - Universidad Nacional del Sur – CONICET CC 717 - 8000 Bahía Blanca, Prov. Buenos Aires, Argentina;2. IDTQ-Grupo Vinculado PLAPIQUI – CONICET, Argentina;3. Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de Córdoba – Av. Vélez Sarsfield 1611, Ciudad Universitaria, X5016GCA Córdoba, Argentina;4. Departmento de Engenharia Quimica, Universidad Estadual de Maringá, 87020-900 Maringá, PR, Brazil;1. Chongqing Institute of Green and Intelligent Technology (CIGIT), Chinese Academy of Sciences, Chongqing 400714, PR China;2. Key Laboratory of Reservoir Aquatic Environment, Chinese Academy of Sciences, Chongqing 400714, PR China;1. Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, Fisciano, SA 84084, Italy;2. PEI, Industrial Engineering Program, Department of Chemical Engineering, Federal University of Bahia, Rua Prof. Aristides Novis, 2, Federação, 40210-630 Salvador, BA, Brazil |
| |
| Abstract: | We demonstrate the use of a quartz crystal viscometer to determine the viscosity of solutions of polystyrene in limonene in the presence of high pressure carbon dioxide. These measurements were determined up to 50 bar in the range of temperature from 20 to 40 °C and at 0.025, 0.05, 0.1, 0.2, 0.3 and 0.4 g PS per ml of limonene. The selected variables of study (pressure, temperature and concentration) were statistically significant over the range of viscosity studied. The viscosities of the solutions at all loadings were found to decrease with increasing temperature and pressure while the plastising effect of CO2 prevailing over the hydrostatic pressure applied by the gas. The flow activation energies of the system were obtained from an Arrhenius fitting of the experimental data reaching a maximum of 40 kJ/mol. An empirical model correlating the viscosity of the mixtures to pressure and temperature was developed in order to interpolate and extrapolate in the study region or in a range close to the working limits. Finally, the viscosity data were used to determine the solvent quality and to quantify the demixing points of the mixtures. |
| |
| Keywords: | Viscosity Polystyrene Limonene Carbon dioxide Rheology Phase separation |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
